/Engine/Source/Runtime/ApplicationCore/Public/GenericPlatform/GenericPlatformInputDeviceMapper.h
Gather all currently connected input devices
The number of connected input devices
virtual int32 GetAllConnectedInputDevices ( [TArray](API\Runtime\Core\Containers\TArray)< [FInputDeviceId](API\Runtime\Core\Misc\FInputDeviceId) > & OutInputDevices ) const